System and method for secure client hosted virtualization in an information handling system

ABSTRACT

A client hosted virtualization system (CHVS) includes a processor and non-volatile memory with BIOS code and virtualization manager code. The virtualization manager initializes the CHVS, authenticates a virtual machine image and launches the virtual machine based on the image. The CHVS is configurable to execute the BIOS or the virtualization manager. A client system update network includes a client update system and a CHVS with a processor, a security processor, and non-volatile memory with BIOS code and virtualization manager code that initializes the CHVS, authenticates a virtual machine image and launches a virtual machine based on the image. The CHVS is configurable to execute the BIOS or the virtualization manager. The client update system receives updates and sends them to the CHVS. The CHVS authenticates the updates with the security processor, and overwrites the non-volatile memory with the updates.

RELATED APPLICATIONS

This application is related to U.S. patent application Ser. No. 12/790,550, still pending, entitled “System and Method for I/O Port Assignment and Security Policy Application in a Client Hosted Virtualization System,” by Yuan-Chang Lo et al., filed of even date herewith, which is hereby incorporated by reference.

This application is related to U.S. patent application Ser. No. 12/790, 545, still pending, entitled “System and Method for Supporting Task Oriented Devices in a Client Hosted Virtualization System,” by David Konetski et al., filed of even date herewith, which is hereby incorporated by reference.

This application is related to U.S. patent application Ser. No. 12/790, 548, still pending, entitled “System and Method for Supporting Secure Subsystems in a Client Hosted Virtualization System,” by David Konetski et al., filed of even date herewith, which is hereby incorporated by reference.

This application is related to U.S. patent application Ser. No. 12/790, 547, still pending, entitled “System and Method for Supporting Full Volume Encryption Devices in a Client Hosted Virtualization System,” by David Konetski et al., filed of even date herewith, which is hereby incorporated by reference.

FIELD OF THE DISCLOSURE

The present disclosure generally relates to information handling systems, and more particularly relates to secure client hosted virtualization in an information handling system.

BACKGROUND

As the value and use of information continues to increase, individuals and businesses seek additional ways to process and store information. One option is an information handling system. An information handling system generally processes, compiles, stores, or communicates information or data for business, personal, or other purposes. Technology and information handling needs and requirements can vary between different applications. Thus information handling systems can also vary regarding what information is handled, how the information is handled, how much information is processed, stored, or communicated, and how quickly and efficiently the information can be processed, stored, or communicated. The variations in information handling systems allow information handling systems to be general or configured for a specific user or specific use such as financial transaction processing, airline reservations, enterprise data storage, or global communications. In addition, information handling systems can include a variety of hardware and software resources that can be configured to process, store, and communicate information and can include one or more computer systems, graphics interface systems, data storage systems, and networking systems. Information handlings systems can also implement various virtualized architectures.

BRIEF DESCRIPTION OF THE DRAWINGS

It will be appreciated that for simplicity and clarity of illustration, elements illustrated in the Figures are not necessarily drawn to scale. For example, the dimensions of some elements may be exaggerated relative to other elements. Embodiments incorporating teachings of the present disclosure are shown and described with respect to the drawings herein, in which:

FIG. 1 is a block diagram illustrating an information handling system according to an embodiment of the present disclosure;

FIG. 2 illustrates an embodiment of a client hosted virtualization system on an information handling system;

FIG. 3 is a flow chart illustrating an embodiment of a method of providing a client hosted virtualization system;

FIG. 4 is a block diagram illustrating an embodiment of a client hosted virtualization update network;

FIGS. 5 and 6 are flow charts illustrating embodiments of methods for receiving updates to a client hosted virtualization system;

FIG. 7 is a block diagram illustrating another embodiment of a client hosted virtualization system for implementing I/O port assignment and security policy application; and

FIG. 8 is a flow chart illustrating an embodiment of a method of implementing I/O policies in a client hosted virtualization system.

The use of the same reference symbols in different drawings indicates similar or identical items.

DETAILED DESCRIPTION OF THE DRAWINGS

The following description in combination with the Figures is provided to assist in understanding the teachings disclosed herein. The description is focused on specific implementations and embodiments of the teachings. This focus is provided to assist in describing the teachings, and should not be interpreted as a limitation on the scope or applicability of the teachings. Other teachings can be used in this application. The teachings can also be used in other applications, and with different types of architectures, such as distributed computing architectures, client/server architectures, or middleware server architectures and associated resources.

In the embodiments described below, an information handling system can include any instrumentality or aggregate of instrumentalities operable to compute, classify, process, transmit, receive, retrieve, originate, switch, store, display, manifest, detect, record, reproduce, handle, or use any form of information, intelligence, or data for business, scientific, control, entertainment, or other purposes. For example, an information handling system can be a personal computer, a PDA, a consumer electronic device, a network server or storage device, a switch router, wireless router, or other network communication device, or any other suitable device and can vary in size, shape, performance, functionality, and price. The information handling system can include memory (volatile (e.g. random-access memory, etc.), nonvolatile (read-only memory, flash memory etc.) or any combination thereof), one or more processing resources, such as a central processing unit (CPU), a graphics processing unit (GPU), hardware or software control logic, or any combination thereof. Additional components of the information handling system can include one or more storage devices, one or more communications ports for communicating with external devices, as well as, various input and output (I/O) devices, such as a keyboard, a mouse, a video/graphic display, or any combination thereof. The information handling system can also include one or more buses operable to transmit communications between the various hardware components. Portions of an information handling system may themselves be considered information handling systems.

An information handling system can implement a secure client hosted virtualization (CHV) architecture with a CHV manager that resides in secure memory of the information handling system, and that receives secure updates from a managed backend. The CHV manager can launch one or more virtual machines on the information handling system. The CHV architecture can support I/O port assignment and I/O security policy implementation for the virtual machines. The CHV architecture can also provide a secure interface to security resources of the information handling system to provide pre-boot authentication, platform hardware and software authentication, secure biometric user authentication, and other trusted computing features for the virtual machines. The CHV manger can support task oriented devices such that each virtual machine obtains the functionality of the task oriented devices. The CHV manager also can support storage using full volume encryption (FVE) mechanisms, and provide access to common storage devices for multiple virtual machines.

FIG. 1 is a block diagram illustrating an embodiment of an information handling system 100, including a processor 110, a chipset 120, a memory 130, a graphics interface 140, an input/output (I/O) interface 150, a disk controller 160, a network interface 170, and a disk emulator 180. In a particular embodiment, information handling system 100 is used to carry out one or more of the methods described below. In a particular embodiment, one or more of the systems described below are implemented in the form of information handling system 100.

Chipset 120 is connected to and supports processor 110, allowing processor 110 to execute machine-executable code. In a particular embodiment (not illustrated), information handling system 100 includes one or more additional processors, and chipset 120 supports the multiple processors, allowing for simultaneous processing by each of the processors and permitting the exchange of information among the processors and the other elements of information handling system 100. Chipset 120 can be connected to processor 110 via a unique channel, or via a bus that shares information among processor 110, chipset 120, and other elements of information handling system 100.

Memory 130 is connected to chipset 120. Memory 130 and chipset 120 can be connected via a unique channel, or via a bus that shares information among chipset 120, memory 130, and other elements of information handling system 100. In particular, a bus can share information among processor 110, chipset 120 and memory 130. In another embodiment (not illustrated), processor 110 is connected to memory 130 via a unique channel. In another embodiment (not illustrated), information handling system 100 can include separate memory dedicated to each of the one or more additional processors. A non-limiting example of memory 130 includes static random access memory (SRAM), dynamic random access memory (DRAM), non-volatile random access memory (NVRAM), read only memory (ROM), flash memory, another type of memory, or any combination thereof.

Graphics interface 140 is connected to chipset 120. Graphics interface 140 and chipset 120 can be connected via a unique channel, or via a bus that shares information among chipset 120, graphics interface 140, and other elements of information handling system 100. Graphics interface 140 is connected to a video display 144. Other graphics interfaces (not illustrated) can also be used in addition to graphics interface 140 if needed or desired. Video display 144 can include one or more types of video displays, such as a flat panel display or other type of display device.

I/O interface 150 is connected to chipset 120. I/O interface 150 and chipset 120 can be connected via a unique channel, or via a bus that shares information among chipset 120, I/O interface 150, and other elements of information handling system 100. Other I/O interfaces (not illustrated) can also be used in addition to I/O interface 150 if needed or desired. I/O interface 150 is connected via an I/O interface 152 to one or more add-on resources 154. Add-on resource 154 is connected to a storage system 190, and can also include another data storage system, a graphics interface, a network interface card (NIC), a sound/video processing card, another suitable add-on resource or any combination thereof. I/O interface 150 is also connected via I/O interface 152 to one or more platform fuses 156 and to a security resource 158. Platform fuses 156 function to set or modify the functionality of information handling system 100 in hardware. Security resource 158 provides a secure cryptographic functionality and can include secure storage of cryptographic keys. A non-limiting example of security resource 158 includes a Unified Security Hub (USH), a Trusted Platform Module (TPM), a General Purpose Encryption (GPE) engine, another security resource, or a combination thereof.

Disk controller 160 is connected to chipset 120. Disk controller 160 and chipset 120 can be connected via a unique channel, or via a bus that shares information among chipset 120, disk controller 160, and other elements of information handling system 100. Other disk controllers (not illustrated) can also be used in addition to disk controller 160 if needed or desired. Disk controller 160 can include a disk interface 162. Disk controller 160 can be connected to one or more disk drives via disk interface 162. Such disk drives include a hard disk drive (HDD) 164 or an optical disk drive (ODD) 166 such as a Read/Write Compact Disk (R/W-CD), a Read/Write Digital Video Disk (R/W-DVD), a Read/Write mini Digital Video Disk (R/W mini-DVD, another type of optical disk drive, or any combination thereof. Additionally, disk controller 160 can be connected to disk emulator 180. Disk emulator 180 can permit a solid-state drive 184 to be coupled to information handling system 100 via an external interface 182. External interface 182 can include industry standard busses such as USB or IEEE 1394 (Firewire) or proprietary busses, or any combination thereof. Alternatively, solid-state drive 184 can be disposed within information handling system 100.

Network interface device 170 is connected to I/O interface 150. Network interface 170 and I/O interface 150 can be coupled via a unique channel, or via a bus that shares information among I/O interface 150, network interface 170, and other elements of information handling system 100. Other network interfaces (not illustrated) can also be used in addition to network interface 170 if needed or desired. Network interface 170 can be a network interface card (NIC) disposed within information handling system 100, on a main circuit board such as a baseboard, a motherboard, or any combination thereof, integrated onto another component such as chipset 120, in another suitable location, or any combination thereof. Network interface 170 includes a network channel 172 that provide interfaces between information handling system 100 and other devices (not illustrated) that are external to information handling system 100. Network interface 170 can also include additional network channels (not illustrated).

Information handling system 100 includes one or more application programs 132, and Basic Input/Output System and Firmware (BIOS/FW) code 134. BIOS/FW code 134 functions to initialize information handling system 100 on power up, to launch an operating system, and to manage input and output interactions between the operating system and the other elements of information handling system 100. In a particular embodiment, application programs 132 and BIOS/FW code 134 reside in memory 130, and include machine-executable code that is executed by processor 110 to perform various functions of information handling system 100. In another embodiment (not illustrated), application programs and BIOS/FW code reside in another storage medium of information handling system 100. For example, application programs and BIOS/FW code can reside in HDD 164, in a ROM (not illustrated) associated with information handling system 100, in an option-ROM (not illustrated) associated with various devices of information handling system 100, in storage system 190, in a storage system (not illustrated) associated with network channel 172, in another storage medium of information handling system 100, or a combination thereof. Application programs 132 and BIOS/FW code 134 can each be implemented as single programs, or as separate programs carrying out the various features as described herein.

FIG. 2 illustrates an embodiment of a CHV system 200 including a client system 210 operating at a platform level 292, an optional virtual machine hypervisor 250 operating at a protection level 294 that is the most protected level, virtual machines 260 and 270, and one or more additional virtual machines 280 operating at a protection level 296 that is above protection level 294, or less protected than virtual machine hypervisor 250. At the platform level 292, client system 210 includes client platform hardware 220, trusted platform firmware 230, and a CHV manager 240. In a particular embodiment, client system 210 is an information handling system similar to information handling system 100. As such, client platform hardware 220 includes a processor (not illustrated) that operates to execute machine-executable code included in trusted platform firmware 230 and CHV manager 240 to perform the functions of CHV system 200. Client platform hardware 220 also includes a TPM 222, a USH 224, a GPE 226, and a fuse/switch bank 228. Trusted platform firmware 230 includes a BIOS 232. CHV manager 240 may include any or all of a service operating system (OS) 242, a stack of drivers 244, a policy manager 246, and an update manager 248. In a particular embodiment, virtual machine hypervisor 250 is a commercially available hypervisor such as Microsoft Virtual PC, Xen, VMware, or other such virtualization systems that may reside in a mass storage device (not illustrated).

CHV manager operates from the platform level 292 to initialize CHV system 200 on power up, to launch virtual machines 260, 270, and 280, and to manage input and output interactions between virtual machines 260, 270, and 280 and client platform hardware 220. In this respect, CHV manager 240 functions similarly to a combination of a platform BIOS and a virtual machine manager or hypervisor. As such, CHV manager 240 is stored in a non-volatile memory (not illustrated) of client platform hardware 220, such as a firmware ROM embedded on the system board that is separate from the mass storage device used to store the images for virtual machines 260, 270, and 280, and that retains the code stored thereon when client system 210 is powered. In a particular embodiment, CHV manager 240 provides that the launching of virtual machines 260, 270, and 280 is secure, using digital signatures to verify the authenticity of the virtual machine images for virtual machines 260, 270, and 280. For example, client system 210 can include hardware extensions with security capabilities to ensure secure launch and execution of virtual machines 260, 270, and 280, such as Trusted Execution Technology (TXT) or other hardware extension technology. In a particular embodiment, CHV manager 240 operates with GPE 226 to fully encrypt virtual machines 260, 270, and 280 in storage. By operating CHV manager from the platform level 292, client system 210 is secure from malicious software or virus attacks that might otherwise affect the operations of client system 210. Moreover, by encrypting virtual machines 260, 270, and 280 at rest, CHV system 200 provides a tamper resistant storage method for the images of virtual machines 260, 270, and 280.

In an optional embodiment, virtual machine hypervisor 250 can be operated at protection level 294 to launch virtual machines 260, 270, and 280. Note that one of CHV manager 240 or virtual machine hypervisor 250 is selected to launch virtual machines 260, 270, and 280, and that where one of the CHV manager or the virtual machine hypervisor is operating to manage the virtual machines, the other is not operating to manage the virtual machines. When launched, virtual machines 260, 270, and 280 each include associated user data 262, 272, and 282; associated user preference information 264, 274, and 284; associated applications 266, 276, and 286; and associated operating systems 268, 278, and 288, respectively. Thus each virtual machine 260, 270, and 280 is isolated from the others, operates as an individual information handling system on client system 210, and shares the resources of client platform hardware 220. The operating CHV manager 240 or virtual machine hypervisor 250 functions to manage the access of each of virtual machines 260, 270, and 280 to the resources of client platform hardware 220. Virtual machines 260, 270, and 280 can include anti-virus software (not illustrated) that is tailored to the associated OSs 268, 278, and 288, thus providing an additional layer of security to the operations of CHV system 200.

The configuration of client platform 210 is determined by the particular devices and architecture of client platform hardware 220 and the content of trusted platform firmware 230 and CHV manager 240. The devices and architecture of client platform hardware 220 is determined at the time of manufacture of client system 210. The content of trusted platform firmware 230 and CHV manager 240 is installed on a non-volatile memory storage device (not illustrated) in client platform hardware 220 at the time of manufacture. In a particular embodiment, the manufacturer or a user of client platform 210 determines that the client platform is intended for use as a client hosted virtualization platform, and initiates a hardware function to toggle an element of fuse/switch bank 228 to enable CHV manager 240.

In a particular embodiment, toggling the element of fuse/switch bank 228 permanently enables CHV manager 240. Here, each time client platform 210 is booted, trusted platform firmware 230 performs low level system boot activities, and then passes control to CHV manager 240. An example of permanently enabling CHV manager 240 can include blowing a hardware fuse in fuse/switch bank 228 that permanently provides for a boot path that passes control to CHV manager 230. Another example can include providing a particular bit or set of bits in fuse/switch bank 228 in a platform ROM (not illustrated) that is not re-writable. In the case of blowing a hardware fuse, the hardware fuse can be blown at the time of manufacture of client system 210, or by a user of client system at a later date. In the case of providing bits in a platform ROM, the bits can be provided at the time of manufacture of client system 210.

In another embodiment, client platform 210 includes a mechanism to selectably override the permanent enablement of CHV manager 240 such that when client platform 210 is booted, BIOS 232 performs low level system boot activities, and then passes control to virtual machine hypervisor 250. For example, the particular bit or set of bits in fuse/switch bank 228 can reside in a re-writeable non-volatile memory, such that client platform 210 can be reprogrammed to disable CHV manager 240. In another example, a boot option provided by trusted platform firmware 230 can prompt a user of client platform 210 as to whether to boot to CHV manager 240 control, or to virtual machine hypervisor 250 control.

When control of client system 210 is passed to the CHV manager, CHV manager 242 launches service OS 242 to establish the controlled virtualization environment, including launching virtual machines 250, 260, and 270, and controlling the elements of client platform hardware 220. Service OS 242 supports I/O port assignment between virtual machines 250, 260, and 270 and client platform hardware 220, and provides a secure interface to TPM 222, USH 224, and GPE 226 for pre-boot authentication, platform hardware and software authentication, secure biometric user authentication, and other trusted computing features for the virtual machines. Service OS 242 also supports task oriented devices and FVE storage for virtual machines 250, 260, and 270, and provides access to common storage devices. Policy manager 246 implements security policies between virtual machines 250, 260, and 270 and the devices of client platform hardware 220. Because the content of trusted platform firmware 230 and CHV manager 240 resides on the non-volatile memory storage device, the trusted platform firmware code and the CHV manager code is executed securely within platform level 292, and the basic operation of client system 210 is less susceptible to attack from malicious program code, viruses, worms, or other corrupting programs, and client system 210 embodies a secure CHV architecture.

FIG. 3 illustrates an embodiment of a method of providing a CHV system in a flowchart form, starting at block 300. A CHV platform fuse is set in an information handling system in block 301. For example, a manufacturer of client platform 210 can determine that client platform 210 is intended for use as CHV system 200, and can set blow a fuse in fuse/switch bank 228. In an embodiment (not illustrated), a user or manufacturer of client platform 210 can write a particular bit or set of bits to platform ROM to configure client system 210 as CHV system 200. The information handling system is booted in block 302, and a decision is made as to whether or not the information handling system has a BIOS boot option enabled in decision block 303. For example client platform 210 may or may not include a boot option that permits client platform 210 to boot with BIOS 232. If the information handling system does not have a BIOS boot option enabled, the “NO” branch of decision block 303 is taken, the boot process runs a CHV manager in block 304, and the method ends in block 314. Thus client platform 210 cannot have a BIOS boot option, and can launch CHV manager 240 and proceed to launch virtual machines 250, 260, and 270.

If the information handling system has a BIOS boot option enabled, the “YES” branch of decision block 303 is taken, and a decision is made as to whether or not the BIOS boot option has been selected in decision block 305. If not, the “NO” branch of decision block 305 is taken, the boot process runs the CHV manager in block 304, and the method ends in block 307. If the BIOS boot option is selected, the “YES” branch of decision block 305 is taken, the boot process proceeds to boot in BIOS in block 306, and the method ends in block 307. For example, a user of client platform 210 may select a boot option to boot client platform 210 with BIOS 232, and client platform 210 can then boot using BIOS 232, and can then launch virtual machine hypervisor 250 or another conventional operating system on the bare system.

The content of trusted platform firmware 230 and CHV manager 240 is alterable by reprogramming the non-volatile memory storage device, permitting revision control of the contents of trusted platform firmware 230 and CHV manager 240. For example, firmware code associated with the devices of client platform hardware 220, such as drivers, application programming interfaces (APIs), or user interfaces (UIs) in trusted platform firmware 230, or the BIOS code associated with BIOS 232 can be periodically updated or modified. Similarly, CHV manager code associated with service OS 242, drivers 244 or update manager 248, or policy profile data associated with policy manager 246 can be periodically updated or modified. Here, the fact that trusted platform firmware 230 and CHV manager 240 are stored in the non-volatile memory storage device ensures a level of security related to the ability to perform updates.

In another embodiment, update manager 248 functions in cooperation with TPM 222 to provide an encryption and authentication capability with regard to updates to trusted platform firmware 230 and CHV manager 240. Here, the capability to perform an update is enabled by a locked platform feature, where the key to unlock the feature is associated with a public key infrastructure (PKI). Updates to trusted platform firmware 230 or to CHV manager 240 include key information. When update manager 248 receives an update to trusted platform firmware 230 or to CHV manager 240, update manager 248 provides the key information to TPM 222 to authenticate the update. If the update is authenticated, then update manager 248 proceeds to implement the update. If the update is not authenticated, the update manager 248 does not implement the update. In a particular embodiment, updates to trusted platform firmware 230 or to CHV manager 240 are also encrypted, and TPM 222 decrypts authenticated updates prior to being implemented by update manager 248.

FIG. 4 illustrates an embodiment of a CHV update network 400 including a client system 410, a network 420, and a CHV update system 430. CHV update system 430 includes a network interface 435, a client image database 440, a client image compiler 445, a virtual machine image database 450, user profile database 455, and a CHV update manager 460, and can be implemented as a server component of CHV update network 400. CHV update manager 460 includes a service OS image 462, virus definitions database 464, a PKI infrastructure 466, and drivers database 468. Client system 410 is similar to client system 210, and can implement a CHV system similar to CHV system 200. Client system 410 is connected to network 420 via a network channel similar to network channel 172 of information handling system 100. Network 420 represents a network connection between client system 410 and CHV update system 430, and can include public networks such as the Internet or other public networks, or private networks such as private internets or other private networks.

CHV update system 430 communicates with client system 410 through network interface 435 which is connected to network 420. In a particular embodiment, CHV update system 430 determines when a trusted platform firmware 412 or a CHV manager 414 in client system 410 is in need of an update, and CHV update system 430 pushes the needed update to firmware 412 or to CHV manager 414, and an update manager (not illustrated) in CHV manager 414 performs the update to client system 410. In another embodiment, client system 410 periodically polls CHV update system 430 to determine if updates are available for firmware 412 or for CHV manager 414. If an update is available, then client system 410 pulls the available update for firmware 412 or for CHV manager 414, and the update manager performs the update to client system 410.

CHV update system 430 functions to create and maintain the updates for client system 410. As such, the components that make up firmware 412 and CHV manager 414 are stored and maintained in a current state in CHV update manager 460. Thus the operating code for firmware 412 and CHV manager 414 is maintained and updated with new capabilities, fixes to defective capabilities, patches to insecure capabilities, other updates, or a combination thereof. For example, a development team (not illustrated) can maintain the operating code for a service OS, storing modified images in service OS image 462, can store virus definitions for an anti-virus capability of the service OS in virus definitions database 464, and can store drivers associated with the various hardware components of client system 410 in drivers database 468. CHV update manager 460 combines the contents of service OS image 462, virus definitions database 464, and drivers database 468 to provide updates for firmware 412 and CHV manager 414, and encodes the updates with PKI infrastructure 466 to provide a secure update for client system 410. Client image compiler 445 receives the secure update from CHV update manager 460, and combines the secure update with updated virtual machine images from virtual machine image database 450, and with updated user profiles from user profile database 455 to create a client image for client system 410. Client image compiler 445 stores the client image in client image database 440 to be pushed to or pulled from client system 410.

FIG. 5 illustrates an embodiment of a method of pushing an update to a client system in a flowchart form, starting at block 310. A CHV update system reads a firmware and CHV manager revision level from a client system in block 311. For example, CHV update system 430 can determine a revision level for firmware 412 and for CHV manager 414 in client system 410. A decision is made as to whether or not the firmware or the CHV manager are in need of updating in decision block 312. If not, the “NO” branch of decision block 312 is taken, and processing returns to block 311, where the CHV update system reads a firmware and CHV manager revision level from the client system. Here, CHV update system 430 can perform the reads of client system 410 on a periodic basis to ensure that client system 410 includes current revisions of firmware 412 and CHV manager 414. If the firmware or the CHV manager are in need of updating, the “YES” branch of decision block 312 is taken, and the CHV update manager pushes the update to the client system in block 313. Thus client image compiler 445 can combine the elements that are in need of updating from among virtual machine image database 450, user profile database 455, service OS image 462, virus definitions 464, and drivers 468, and CHV update system 430 can send the client image to client system 410. An update manager in the client system installs the update in block 314, and the method ends in block 315. Here, when client system 410 receives the update from CHV update system 430, an update manager (not illustrated) can determine if the update is authentic using a TPM (not illustrated) and then can install authentic the update if it is determined to be authentic.

FIG. 6 illustrates an embodiment of a method of pulling an update to a CHV update system in a flowchart form, starting at block 320. A client system polls the CHV update system to determine if an update is available for a firmware or a CHV manager on the client system in block 321. For example, client system 410 can poll CHV update system 430 to determine if an update is available for firmware 412 or for CHV manager 414. A decision is made as to whether or not a firmware or CHV manager update are available in decision block 322. If not, the “NO” branch of decision block 322 is taken, and processing returns to block 321, where the client system polls the CHV update system to determine if an update is available for the firmware or the CHV manager. Here, client system 410 can poll CHV update system 430 on a periodic basis to ensure that client system 410 includes current revisions of firmware 412 and CHV manager 414. If a firmware or CHV manager update are available, the “YES” branch of decision block 322 is taken, and the client system pulls the updated firmware or CHV manager from the CHV update manager in block 323. Thus a compiled client image can be stored in client image database 440, and client system 410 can request the client image from CHV update system 430. An update manager in the client system installs the update in block 324, and the method ends in block 325. Here, when client system 410 receives the update from CHV update system 430, the update manager can determine if the update is authentic using the TPM and then can install authentic the update if it is determined to be authentic.

FIG. 7 illustrates an embodiment of a CHV system 500 including client platform hardware 520, a CHV manager 540, and virtual machines 560 and 570. Client platform hardware 520 includes an Ethernet NIC 521, a wireless local area network (WiFi) NIC 523, and a USB port 525, and can include one or more additional I/O resources (not illustrated). CHV manager 540 includes a policy manager 548. Virtual machines 560 and 570 each include I/O policy information 561 and 571, respectively. In a particular embodiment, CHV manager 540 is in control of access to Ethernet NIC 521, WiFi NIC 523, USB port 525, and other I/O resources. As such, requests for I/O access from virtual machines 560 and 570 are provided to CHV manager 540, and policy manager 548 determines if the requested I/O access is permitted, based upon the requesting virtual machine's 560 or 570 respective I/O policy information 561 or 571. In the illustrated embodiment, I/O policy information 561 and 571 are included in CHV manager 540. In another embodiment (not illustrated), I/O policy information 561 is included in virtual machine 560 and I/O policy information 571 is included in virtual machine 570. In another embodiment (not illustrated), a portion of I/O policy information 561 and 571 is included in CHV manager 540, and another portion of I/O policy information 561 and 571 is included in virtual machines 560 and 570, respectively.

Policy manager 546 enforces granular control of access to Ethernet NIC 521, WiFi NIC 523, USB port 525, and other I/O resources. Policy manager 546 permits certain types of access requests and denies other access requests, and permits conditional access to the various resources of client platform hardware 520. As such, I/O policy information 561 and 571 can provide for unrestricted access, blocked access, or conditional access depending on the resource, on the user of the respective virtual machine 560 or 570, on the content included in the access request, on the target of the access request, or on other conditions as needed. For example, I/O policy information 561 may dictate that virtual machine 560 has unrestricted access to Ethernet NIC 521, may not access USB port 525, and has conditional access to WiFi NIC such that only access to a corporate WiFi network is permitted. Other examples include permitting access to USB port 525 only when the device connected to the USB port is an authenticated storage device, or when the device connected to the USB port is a human interface device such as a mouse or a keyboard. I/O policy information 561 and 571 can also provide for user consent each time a resource is accessed and for logging of file transfers to and from the resource. The content transferred into and out of the respective virtual machines 560 and 570 can also be filtered such that inbound transfers can be checked for malware or viruses, and outbound transfers can be checked to prevent data leaks.

FIG. 8 illustrates an embodiment of a method of implementing I/O policies in a CHV system in a flowchart form, starting at block 330. A CHV manager receives an I/O access request in block 331. For example, virtual machine 560 can attempt to initiate a file transfer over Ethernet NIC 521, or a USB device plugged into USB port 525 can attempt to enumerate itself to virtual machine 570, and CHV manager 520 can receive the transaction requests. The CHV manager determines the source and destination of the I/O access request in block 332, and verifies an I/O access policy for I/O access requests with the determined source and destination in block 333. Thus CHV manager 520 can identify the source and destination of the file transfer from virtual machine 560 to Ethernet NIC 521, and can access I/O policy information 561 to determine if the requested file transfer is permitted. Here, CHV manager can also determine the user associated with virtual machine 560, the contents of the file to be transferred, or other information related to the I/O policy for virtual machine 560. A decision is made as to whether or not the requested I/O access is allowed in decision block 334. If so, the “YES” branch of decision block 334 is taken, the requested I/O access request is executed in block 335, and the method ends in block 336. For example, CHV manager 520 can determine that the file transfer from virtual machine 560 to Ethernet NIC 521 is allowed and can execute the file transfer. If the requested I/O access is not allowed, the “NO” branch of decision block 334 is taken, the requested I/O access request is denied in block 337, and the method ends in block 336. For example, CHV manager 520 can determine that virtual machine 570 is to be denied access to USB port 525 and can block the USB device from enumerating itself to virtual machine 570.

When referred to as a “device,” a “module,” or the like, the embodiments described above can be configured as hardware. For example, a portion of an information handling system device may be hardware such as, for example, an integrated circuit (such as an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a structured ASIC, or a device embedded on a larger chip), a card (such as a Peripheral Component Interface (PCI) card, a PCI-express card, a Personal Computer Memory Card International Association (PCMCIA) card, or other such expansion card), or a system (such as a motherboard, a system-on-a-chip (SoC), or a stand-alone device). The device or module can include software, including firmware embedded at a device, such as a Pentium class or PowerPC™ brand processor, or other such device, or software capable of operating a relevant environment of the information handling system. The device or module can also include a combination of the foregoing examples of hardware or software. Note that an information handling system can include an integrated circuit or a board-level product having portions thereof that can also be any combination of hardware and software.

Devices, modules, resources, or programs that are in communication with one another need not be in continuous communication with each other, unless expressly specified otherwise. In addition, devices, modules, resources, or programs that are in communication with one another can communicate directly or indirectly through one or more intermediaries.

Although only a few exemplary embodiments have been described in detail above, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of the embodiments of the present disclosure. Accordingly, all such modifications are intended to be included within the scope of the embodiments of the present disclosure as defined in the following claims. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures. 

What is claimed is:
 1. A client hosted virtualization system (CHVS) comprising: a trusted platform module; a processor operable to execute code; and a non-volatile memory including: first code to implement a basic input/output system for the CHVS; second code to implement a virtualization manager operable to: initialize the CHVS; authenticate a first virtual machine image associated with a first virtual machine; and launch the first virtual machine on the CHVS based on the first virtual machine image; and third code to implement an update manager operable to: receive fourth code; determine with the trusted platform module that the fourth code was received from an authenticated source; and over write the non-volatile memory such that the second code is replaced with the fourth code; wherein the CHVS is configurable to execute the first code and not the second code, or to execute the second code and not the first code.
 2. The CHVS of claim 1, further comprising a mass storage device, and wherein the first virtual machine image: is stored on the mass storage device; and includes an operating system and an application.
 3. The CHVS of claim 1, wherein the virtualization manager is further operable to: authenticate a second virtual machine image associated with a second virtual machine; and launch the second virtual machine on the CHVS based on the second virtual machine image.
 4. The CHVS of claim 1, wherein: the BIOS is operable to launch a virtual machine hypervisor; and the virtual machine hypervisor is operable to launch the first virtual machine on the CHVS based on the first virtual machine image.
 5. The CHVS of claim 4, further comprising: a switch operable to maintain a first state or a second state; and wherein the non-volatile memory includes third code operable to: determine if the switch is maintaining the first state or the second state; direct the processor to execute the first code in response to the switch being determined to be in the first state; and direct the processor to execute the second code in response to the switch being determined to be in the second state.
 6. The CHVS of claim 5, wherein: the switch is initially in the first state, and is subsequently placed into the second state; and after being placed into the second state, the switch is permanently in the second state.
 7. The CHVS of claim 1, wherein: the fourth code is encrypted using a public key infrastructure encryption; and the third code is further operable to direct the trusted platform module to decrypt the fourth code before over writing the non-volatile memory.
 8. A client system update network comprising: a client hosted virtualization system (CHVS) having: a processor operable to execute code; a security processor; and a non-volatile memory including: first code to implement a basic input/output system for the CHVS; and second code to implement a virtualization manager operable to initialize the CHVS, authenticate a virtual machine image associated with a first virtual machine, and launch the virtual machine on the CHVS based on the virtual machine image; wherein the CHVS is configurable to execute the first code and not the second code, or to execute the second code and not the first code; and a client update system coupled to the network interface and operable to: receive third code including an update to the second code; encode the third code; and send the third code to the CHVS; wherein the CHVS is operable to: receive the third code; decode and authenticate the third code with the security processor; and in response to determining that the third code is authentic, overwrite the non-volatile memory such that the second code is replaced with the third code.
 9. The client system update network of claim 8, wherein the CHVS further comprises a mass storage device operable to store the first virtual machine image, and wherein the first virtual machine image includes an operating system and an application.
 10. The client system update network of claim 8, wherein: the second code includes a device driver for a particular device of the CHVS; and the third code includes an updated device driver for the particular device.
 11. The client system update network of claim 8, wherein: the client update system is further operable to determine that the third code is newer than the second code; and sending the third code to the CHVS is in response to determining that the third code is newer than the second code.
 12. The client system update network of claim 8, wherein the CHVS is further operable to: determine that the third code is newer than the second code; and request the client update system to send the third code to the CHVS; wherein sending the third code to the CHVS is in response to receiving the request.
 13. A method of providing a client hosted virtualization system (CHVS), comprising: storing, by a processor, first code in a non-volatile memory of the CHVS to implement a basic input/output system for the CHVS; storing, by the processor, second code in the non-volatile memory, the second code being operable to: initialize the CHVS; authenticate a first virtual machine image associated with a first virtual machine; launch the first virtual machine on the CHVS based on the first virtual machine image; authenticate a second virtual machine image associated with a second virtual machine; and launch the second virtual machine on the CHVS based on the second virtual machine image; storing third code in a non-volatile memory of the CHVS, the third code being operable to: receive fourth code; determine that the fourth code was received from an authenticated source; and over write the non-volatile memory such that the second code is replaced with the fourth code; and executing the third code; determining to execute the second code to the exclusion of the first code; and in response to determining to execute the second code, executing the second code.
 14. The method of claim 13, wherein the first virtual machine image includes a first operating system and a first application, and the second virtual machine image includes a second operating system and a second application.
 15. The method of claim 13, the second code being further operable to: receive a first transaction from the first virtual machine; provide the first transaction to an encryption engine; and direct the encryption engine to encrypt the first transaction.
 16. The method of claim 15, the second code being further operable to: receive a second transaction targeted to the first virtual machine, wherein the second transaction is encrypted; provide the second transaction to the encryption engine; direct the encryption engine to decrypt the second transaction; and provide the decrypted second transaction to the first virtual machine.
 17. The method of claim 13, wherein: determining to execute the second code to the exclusion of the first code comprises determining that a switch of the CHVS is maintained in a particular state; and executing the second code is in response to determining that the switch is maintained in the particular state.
 18. The method of claim 17, wherein: the switch is initially in a first state, and is subsequently placed into a second state; and after being placed into the second state, the switch is permanently in the second state. 